Wow a nearly full fuel tank….well NO.  When Lars installed the fuel sensor he mounted the float on the wrong end.  It was kinda puzzling, since the Venus showed 100% full when first connected. So after discussing it with Daniel I fired off an email to Matthijs, who responded with the note that he nearly got a heart attack after his security officers told him they needed to reset servers for an update.  But when Matthijs googled that update he found out it was already out for the last 2 months.   So we exchanged some other incidents typical of working with Indians.  Most fun was Matthijs telling me that even after the one Indian company has worked with them for over 20 + years they still do not follow up on what they promised to do.  So an European setting  is 1-180 ohm. I switched the reading to a US sensor (240 – 30 Ohm) and yes is showed a 135 liter value . (28%).  So Lars had mounted the sensor in reverse.
Yesterday Ron and Jochem connected the Kabola to the main tank, so I have been busy with hoses to try to empty the antique fuel tank and dump all in the big one